Need help picking the right sub

I recently purchased a polk 5000.1 amp which says it is rated at 200 rms bridged at 4 ohms (gonna get some wetsounds pro 80s or some rev10s) and 500 watts rms at 1 ohm for a sub. Now I was thinking about buying a dual voice coil 2 ohm sub and running it in series to get the impedance down to 1 ohm. Does this sound right?

I was thinking this sub. http://www.crutchfield.com/p_500SWR1...1#overview-tab